I am probably missing something here but I found that I have to repurchase the Companion Bible Bundle every time something is added. Is this correct or is there a way to update it without having to repurchase the items already purchased. For instance, Figures of Speech was added but I already purchase the Companion Bible revision, Appendices, and Side Notes. Is it not feasible to just purchase the item added or do I have to repurchase the whole thing each time? Thanks!